diff --git a/packages/web-api/src/WebClient.spec.ts b/packages/web-api/src/WebClient.spec.ts
index cfa84b729..a65c4e8d9 100644
--- a/packages/web-api/src/WebClient.spec.ts
+++ b/packages/web-api/src/WebClient.spec.ts
@@ -1032,7 +1032,6 @@ describe('WebClient', () => {
             test: 'static-body-value',
           });
 
-          await new Promise((resolve) => setTimeout(resolve, 100));
           config.data = expectedBody;
 
           config.headers.test = 'static-header-value';
diff --git a/packages/web-api/src/WebClient.ts b/packages/web-api/src/WebClient.ts
index 25a2e3f69..8389a6361 100644
--- a/packages/web-api/src/WebClient.ts
+++ b/packages/web-api/src/WebClient.ts
@@ -302,7 +302,7 @@ export class WebClient extends Methods {
     // request interceptors have reversed execution order
     // see: https://github.com/axios/axios/blob/v1.x/test/specs/interceptors.spec.js#L88
     if (requestInterceptor) {
-      this.axios.interceptors.request.use(requestInterceptor, null, { synchronous: true });
+      this.axios.interceptors.request.use(requestInterceptor, null);
     }
     this.axios.interceptors.request.use(this.serializeApiCallData.bind(this), null);